When enable vfio-pci mode for NIC driver on Juno board, the IRQ is
failed to forward properly from host to guest, finally root caused this
issue is related with kvmtool cannot re-enable INTx mode properly.
So the basic working flow to reproduce this issue is as below:
Host Guest
------------- --------------------
INTx mode
MSI enable failed in NIC driver
MSI disable in NIC driver
Switch back to INTx mode --> kvmtool doesn't support
So this patch is to support INTx mode re-enabling; 0001/0002 patches
are only minor fixing up for eventfd releasing and remove useless FDs
reservation for INTx. 0003 patch is the core patch for supporting
INTx mode re-enabling, when kvmtool detects MSI is disabled it
rollbacks to INTx mode.
This patch set has been tested on Juno-r2 board.
Leo Yan (3):
vfio-pci: Release INTx's unmask eventfd properly
vfio-pci: Remove useless FDs reservation in vfio_pci_enable_intx()
vfio-pci: Re-enable INTx mode when disable MSI/MSIX
include/kvm/vfio.h | 1 +
vfio/pci.c | 61 +++++++++++++++++++++++++++++++++++++---------
2 files changed, 50 insertions(+), 12 deletions(-)
--
2.19.1
